Finally! Started but headers glow red!

GRX · 11-18-2003, 12:28 AM

I posted this http://forums.corvetteforum.com/zerothread?id=693308 in C4
Tech ...maybe you guys here in Engine mods can offer an opinion why this is happening after motor warms up at about 1500RPM.

Cam:Intake: Duration: 260*
Exhaust: Duration: 270*
Specs at .050" tappet lift:
Intake: Duration: 209*
Exhaust: Duration: 217*
Intake:
Opens at: -5.5 ATDC
Closes at: 34.5 ABDC
Exhaust:
Opens at: 46.5 BBDC
Closes at: -9.5 BTDC
Lobe Lift:
Intake: .330" x 1.5 rocker= .495"
Exhaust: .343" x 1.5 rocker= .515"
Lobe separation: 114

Heads are AFR 190's large valves
Stock intake.

CR is about 8.7:1

Thank you.

[Modified by GRX, 8:34 PM 11/17/2003]

SWCDuke · 11-18-2003, 02:31 AM

What does your ignition map look like?

Duke

GRX · 11-18-2003, 02:43 AM

Well I have the stock prom in it right now.

LD85 · 11-18-2003, 04:56 AM

Check your distributor you could be off a tooth, thats what casued mine to glow!

88-406 · 11-18-2003, 01:35 PM

Verify your fuel pressure is what it supposed to be. Also make sure your base timming is 6-10 with the wire (EST?) disconected. How did the engine sound? Did it rev smoothly or rough? Also is this with stock chip and stock injectors?

KM

[Modified by 88-406, 9:36 AM 11/18/2003]

[Modified by 88-406, 9:37 AM 11/18/2003]

GRX · 11-18-2003, 01:42 PM

Fuel press is around 40psi. Timing was set to just start the motor. Engine was smooth. Yes, stock chip and injectors.

black bart · 11-18-2003, 01:49 PM

In addition to slow timming a vaccum leak can cause that also.

88-406 · 11-18-2003, 01:52 PM

VERIFY your timming with a light. A few degrees in the wrong direction and you get what you got! How confident are you that your pointer is setup correctly? You wouldn't want to hurt that beautiful Bowtie would you?

I would think your engine should give a decent idle with the stock Inj's and chip. The only reason I say this is because I've started my 383 with my stock chip before and it idled fine.

KM